Flexural Performance of Doubly Reinforced High Strength Geopolymer Concrete Beams Without Compression Reinforcement

In this paper, using steel fiber-reinforced geopolymer concrete (SFRGC) without compression reinforcement, an experimental study is conducted to evaluate the flexural strength of a doubly reinforced concrete beam. Three beams of 1500 mm x 150 mm x 200 mm were molded to assess the flexural strength. One beam had tension and compression reinforcement using geopolymer concrete, and the other two beams had tension reinforcement but no compression reinforcement and used fiber-reinforced geopolymer concrete in the compression zone in one beam and high strength fiber-reinforced geopolymer concrete in another. The specimens are put through flexural testing after curing in heat chamber at 75℃ − 80°C for 24 hours by applying load at one-third locations. The outcome demonstrates that, when compared to the other two beams, the high strength fiber-reinforced geopolymer concrete beam performs better in terms of ultimate load carrying capacity, stiffness, ductility index, energy absorption capacity, and mode of failure.